5/8-18 左ねじ メス → 9mm QD オス 水アダプター

The threads on this adapter match perfectly with my 20 series torch, so there's no wobble or leaking at the connection point. It took less than a minute to install, and now I can swap hoses in seconds instead of messing with wrenches.

Finally found something that actually lets me swap torches without fighting with wrenches every time. I was worried the threads might be sloppy, but on my 20 series torch it cinched up nice and snug.

Threaded right onto my 20 series torch without any fuss and the 9mm QD male locks in solid with zero leaks so far. Exactly what I needed to finally run my water cooled setup with a quick connect.